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Effects of feeding broilers with rapeseed meals containing different levels of total glucosinolate and progoitrin



Effects of feeding broilers with rapeseed meals containing different levels of total glucosinolate and progoitrin



Scientia Agricultura Sinica 21(3): 84-90



An experiment was conducted to investigate the effects of different levels of total glucosinolate (TG) and progoitrin (PG) in broiler rations on performance and health of broilers from 0 to 28 days of age. Four rapeseed meal (RSM) rations with 13.44, 1.82, 11.04 and 3.64 and .mu.mol of TG including 8.26, 1.20, 6.56 and 1.76 .mu.mol of PG per g. respectively and one soybean meal (SBM) ration were used in this experiment. Following results were obtained: 1. Twenty percent high glucosinolate (HG) RSM ration with 13.44 .mu. mol TG including 8.26 .mu. mol PG per g. has the least bodyweight gain, the poorest palatability and feed efficiency, and the biggest enlargement of livers and thyroid glands, while the SBM ration has the best performance and health of broilers. 2. Broilers fed 20% low glucosinolate (LG) RSM ration with 3.64 .mu. mol TG including 1.76 .mu. mol PG per g. have similar weight gain and feed consumption to SBM ration, and the second better feed conversion, smaller enlargement of livers and thyroid glands than 20% HG-RSM rations both detoxified and undetoxified, but bigger than SBM ration. 3. Undetoxified RSM including both HG and LG types have a strong capacity of causing leg weakness of broilers, but no leg weakness is found in broilers fed detoxified RSM and SMB rations. That suggests the factors of causing leg weakness are not glucosinolates or their hydrolytic products, and those factors are eliminated by our detoxification processing. 4. The contents of OZT in livers, thyroids, meat and blood at 28 days of age wre corresponding tothose in feed. The contents of OZT in fresh livers of broilers fed 20% HG-RSM and 20% and LG-RSM rations were 0.74 and 0.43.mu.g/g, and in fresh thyroids, were 5.21 and 2.83 .mu.g/g, respectively.

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Accession: 001580786

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